Create the sys/time.h portability header

Summary: Windows doesn't have it.

Reviewed By: yfeldblum

Differential Revision: D2979215

fb-gh-sync-id: 030bdcaa44deb18834903705a26369ce0b13abc6
shipit-source-id: 030bdcaa44deb18834903705a26369ce0b13abc6

folly/Makefile.am

@@ -268,6 +268,7 @@ nobase_follyinclude_HEADERS = \
 	portability/Environment.h \
 	portability/GFlags.h \
 	portability/Syscall.h \
+	portability/SysTime.h \
 	portability/SysUio.h \
 	Preprocessor.h \
 	ProducerConsumerQueue.h \
@@ -393,6 +394,7 @@ libfolly_la_SOURCES = \
 	MacAddress.cpp \
 	MemoryMapping.cpp \
 	portability/Environment.cpp \
+	portability/SysTime.cpp \
 	Random.cpp \
 	SafeAssert.cpp \
 	SharedMutex.cpp \

folly/portability/SysTime.cpp

+/*
+ * Copyright 2016 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <folly/portability/SysTime.h>
+
+#ifdef _WIN32
+#include <cstdint>
+#include <Windows.h>
+
+extern "C" int gettimeofday(timeval* tv, timezone*) {
+  constexpr auto posixWinFtOffset = 116444736000000000ULL;
+
+  if (tv) {
+    FILETIME ft;
+    GetSystemTimeAsFileTime(&ft);
+    uint64_t ns = *(uint64_t*)&ft;
+    tv->tv_usec = (long)((ns / 10ULL) % 1000000ULL);
+    tv->tv_sec = (long)((ns - posixWinFtOffset) / 10000000ULL);
+  }
+
+  return 0;
+}
+#endif

folly/portability/SysTime.h

+/*
+ * Copyright 2016 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#ifndef _WIN32
+#include <sys/time.h>
+#else
+// Someone decided this was a good place to define timeval.....
+#include <WinSock2.h>
+struct timezone {
+  int tz_minuteswest;
+  int tz_dsttime;
+};
+
+extern "C" int gettimeofday(timeval* tv, timezone*);
+#endif